Capped collections seem to reserve their recordIds separately. Currently we're following the model of making sure that a collection can't be both capped:true and recordIdsReplicated:true. But it might be worth changing this to allow capped collections to have recordIdsReplicated:true.

Also to be considered while doing this is how the cloneCollectionAsCapped and convertToCapped commands should behave. We need to make sure that they are correct.

In particular, during initial sync the node seems to crash on capped_converToCapped1.js because a collection with recordIdsReplicated:true ends up being converted and then obtains the capped:true property as well. See comments.